Emergency workers bring a wounded student to the triage scene near Columbine High School in Littleton Colo., on Tuesday, April 20, 1999. Three young men in fatigues and black trench coats opened fire at the suburban Denver high school Tuesday in what police called a suicide mission. The sheriff said 25 people may have been killed, and that two of the suspects were found dead in the library. (AP Photo/The Denver Rocky Mountain News, George Kochaniec) MANDATORY CREDIT